Huo Xiang (Guang Huo Xiang)
Quick Facts
- What it is: A fragrant Chinese medicinal leaf, also called patchouli, used for short bouts of nausea, poor appetite and loose stools.
- Main uses: Nausea and vomiting, Loose stools, Poor appetite with bloating, Travel sickness
- Best for: Short-term stomach upset in hot, humid weather
- Active ingredients: Patchouli alcohol (patchoulol), Pogostone, Beta-patchoulene, Flavonoids
- Forms: Dried herb for decoction, Granules and powdered extract, Capsules, Ready-made Huo Xiang Zheng Qi liquid
- Time to effect: Usually within an hour or two of a dose, if it helps at all.
- Side effects: Mild stomach upset or dry mouth are the usual complaints; the essential oil must never be swallowed.
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What is Huo Xiang (Guang Huo Xiang)?
Huo Xiang is a fragrant leaf used in Chinese herbal medicine. People take it for queasiness, poor appetite and loose stools. It is used most in hot, damp weather.
It is a single herb, not a blend. Even so, it is most often taken inside a classic formula. In the West, the plant is better known as patchouli.
Two related plants share the name. Guang Huo Xiang is Pogostemon cablin (patchouli). Tu Huo Xiang is Agastache rugosa (Korean mint).
Chinese pharmacies today usually supply Guang Huo Xiang. Most modern research uses that plant as well.
Here is the evidence in one line. Huo Xiang is a long-standing staple of Chinese medicine. But good human trials of the herb on its own are almost absent, so its benefits stay unproven.
Long use and proof of effect are two different things. That applies to everything on this page.
How does Huo Xiang (Guang Huo Xiang) work?
No one has shown clearly how Huo Xiang works in people. What follows is theory, not settled fact.
In Chinese medicine, Huo Xiang is said to "transform dampness" and settle the stomach. Herbalists use those words for heaviness, nausea and slow digestion in muggy weather.
In the lab, the fragrant oil of the herb relaxes gut muscle. It also slows the movement of the gut. And it lowers markers of inflammation (swelling) in cells and in animals.
The oil also fights bacteria and viruses in a dish. None of this has been confirmed as the reason people feel better after drinking it.
What forms does Huo Xiang (Guang Huo Xiang) come in?
Huo Xiang is sold in several forms. The dried herb is the one traditional practice is built on.
Common forms include: - dried cut leaf and stem for decoction (a simmered water extract) - fresh leaf in warm climates - granules or powdered extract - ready-made liquids or capsules of the formula Huo Xiang Zheng Qi
Patchouli essential oil is also sold widely. But that is a perfume and aromatherapy product, not the form used as medicine. It is also far stronger.
Where it comes from:
Huo Xiang has been used in Chinese medicine for well over a thousand years. It appears in Song dynasty texts.
Its best-known home is the formula Huo Xiang Zheng Qi San. This was recorded in the official Song pharmacopoeia (an official list of medicines) around the 12th century. Chinese homes and pharmacies still stock it today for summer stomach upsets and travel sickness.
Patchouli is also grown across Southeast Asia and India. There it is raised mainly for its oil and as an insect repellent.
Who should avoid Huo Xiang (Guang Huo Xiang)?
- Never swallow patchouli essential oil, or any undiluted aromatherapy oil, as it can burn the mouth and stomach
- Do not use if you are pregnant or breastfeeding, unless a qualified practitioner is supervising you, as safety has not been tested
- Do not use if you have ever had a rash, swelling or breathing trouble after patchouli, mint or other plants in the mint family
- Do not use if you are taking warfarin or another blood thinner, without first asking your doctor or pharmacist
- Do not use it to treat ongoing vomiting, blood in the stool, or diarrhoea lasting more than a few days — these need medical assessment, not a herb
- Do not give it to babies or young children except on the advice of a qualified practitioner
- Avoid using it alongside other Chinese formulas that already contain Huo Xiang, so you do not double the dose without knowing
When should you see a doctor?
See a doctor if vomiting or diarrhoea lasts more than two or three days, or if you cannot keep fluids down. Get medical help the same day if you have a high fever, severe stomach pain, blood in your vomit or stool, or signs of dehydration such as very little urine, dizziness on standing or a dry mouth that will not clear. Stop the herb and seek care straight away if you develop a rash, swelling of the face, lips or tongue, or any trouble breathing. If you take warfarin, another blood thinner, or a medicine with a narrow safe range such as ciclosporin, digoxin or an epilepsy drug, talk to your doctor or pharmacist before you start.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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